Remove @Nullable on local variables

>> `@Nullable` and `@NonNull` aren't applied to local variables—at least not their root types. (They should be applied to type arguments and array components.) The reason is that it is possible to infer whether a variable can be null based on the values that are assigned to the variable.

Signed-off-by: Yanming Zhou <zhouyanming@gmail.com>

Author: quaff

module/spring-boot-jackson/src/test/java/org/springframework/boot/jackson/autoconfigure/jsontest/app/ExampleJacksonComponent.java

@@ -45,11 +45,11 @@ static class Serializer extends ObjectValueSerializer<ExampleCustomObject> {
 		@Override
 		protected void serializeObject(ExampleCustomObject value, JsonGenerator jgen, SerializationContext context) {
 			jgen.writeStringProperty("value", value.value());
-			@Nullable Date date = value.date();
+			Date date = value.date();
 			if (date != null) {
 				jgen.writeNumberProperty("date", date.getTime());
 			}
-			@Nullable UUID uuid = value.uuid();
+			UUID uuid = value.uuid();
 			if (uuid != null) {
 				jgen.writeStringProperty("uuid", uuid.toString());
 			}

module/spring-boot-jpa/src/main/java/org/springframework/boot/jpa/autoconfigure/JpaBaseConfiguration.java

@@ -125,7 +125,7 @@ public EntityManagerFactoryBuilder entityManagerFactoryBuilder(JpaVendorAdapter
 			ObjectProvider<PersistenceUnitManager> persistenceUnitManager,
 			ObjectProvider<EntityManagerFactoryBuilderCustomizer> customizers,
 			Map<String, AsyncTaskExecutor> taskExecutors) {
-		@Nullable AsyncTaskExecutor bootstrapExecutor = determineBootstrapExecutor(taskExecutors);
+		AsyncTaskExecutor bootstrapExecutor = determineBootstrapExecutor(taskExecutors);
 		EntityManagerFactoryBuilder builder = new EntityManagerFactoryBuilder(jpaVendorAdapter,
 				this::buildJpaProperties, persistenceUnitManager.getIfAvailable(), null, bootstrapExecutor);
 		if (this.properties.getBootstrap() == Bootstrap.ASYNC) {

module/spring-boot-micrometer-metrics/src/main/java/org/springframework/boot/micrometer/metrics/autoconfigure/PropertiesMeterFilter.java

@@ -125,7 +125,7 @@ public DistributionStatisticConfig configure(Meter.Id id, DistributionStatisticC
 		if (values.isEmpty()) {
 			return defaultValue;
 		}
-		@Nullable T result = doLookup(values, id);
+		T result = doLookup(values, id);
 		return (result != null) ? result : values.getOrDefault("all", defaultValue);
 	}
 

module/spring-boot-security-saml2/src/main/java/org/springframework/boot/security/saml2/autoconfigure/Saml2RelyingPartyRegistrationConfiguration.java

@@ -107,7 +107,7 @@ private RelyingPartyRegistration asRegistration(String id, Registration properti
 					.forEach(credentials::add)));
 		builder.singleLogoutServiceLocation(properties.getSinglelogout().getUrl());
 		builder.singleLogoutServiceResponseLocation(properties.getSinglelogout().getResponseUrl());
-		@Nullable Saml2MessageBinding binding = properties.getSinglelogout().getBinding();
+		Saml2MessageBinding binding = properties.getSinglelogout().getBinding();
 		if (binding != null) {
 			builder.singleLogoutServiceBinding(binding);
 		}

smoke-test/spring-boot-smoke-test-integration/src/test/java/smoketest/integration/producer/ProducerApplication.java

@@ -41,7 +41,7 @@ public ProducerApplication(ServiceProperties serviceProperties) {
 
 	@Override
 	public void run(ApplicationArguments args) throws Exception {
-		@Nullable File inputDir = this.serviceProperties.getInputDir();
+		File inputDir = this.serviceProperties.getInputDir();
 		Assert.notNull(inputDir, "No inputDir configured");
 		inputDir.mkdirs();
 		if (!args.getNonOptionArgs().isEmpty()) {

smoke-test/spring-boot-smoke-test-parent-context/src/test/java/smoketest/parent/producer/ProducerApplication.java

@@ -41,7 +41,7 @@ public ProducerApplication(ServiceProperties serviceProperties) {
 
 	@Override
 	public void run(ApplicationArguments args) throws Exception {
-		@Nullable File inputDir = this.serviceProperties.getInputDir();
+		File inputDir = this.serviceProperties.getInputDir();
 		Assert.notNull(inputDir, "No inputDir configured");
 		inputDir.mkdirs();
 		if (!args.getNonOptionArgs().isEmpty()) {